Joseph Gordon-Levitt (HitRECord on TV (2014)); Emmanuelle Chriqui (Entourage (2015)); The Price Is Right (1972) contestant Danielle Perez. Also: Wiz Khalifa performs. ...

Allison Janney (Spy (2015) and Mom (2013)); Paul Dano (Love and Mercy); 2015 National Spelling Bee co-champions Vanya Shivashankar and Gokul Venkatachalam. Also: Hiatus K ...

Jeremy Piven (Entourage (2015)); author Adam Carolla (Daddy, Stop Talking!). Also: Hozier performs. ...

Jennifer Connelly (Aloft (2014)); director Judd Apatow, author of Sick in the Head: Conversations About Life and Comedy; 2015 North American School Scrabble champions Noa ...

Ray Liotta (Texas Rising (2015)). Also: Zedd performs. ...

George Clooney (Tomorrowland (2015)); Britt Nilsson, the latest castoff from The Bachelorette (2003). ...

Mariah Carey performs. Also: Alexandra Daddario (San Andreas (2015)). ...

Paul Giamatti (San Andreas (2015)); author Bob Pflugfelder. ...

Amy Schumer (Trainwreck (2015)); 2015 Billboard Music Awards (2015) co-host Ludacris. Also: José González performs. ...

Elizabeth Banks (Pitch Perfect 2 (2015)); comedian Marc Maron. Also: Earl Sweatshirt (aka Earl Sweatshirt) performs with BadBadNotGood. ...

Hailee Steinfeld (Pitch Perfect 2 (2015)). Also: Brandon Flowers performs. ...

Singer Adam Levine (The Voice (2011)); Nicholas Hoult (Mad Max: Fury Road (2015) and Kill Your Friends (2015)). Also: Maroon 5 perform. ...

Julie Bowen (Modern Family (2009)); Adam Devine (Pitch Perfect 2 (2015)). Also: Imagine Dragons perform. ...

Ryan Seacrest (American Idol (2002)); Brittany Snow (Pitch Perfect 2 (2015)). Also: a musical mash-up featuring Imagine Dragons and REO Speedwagon. ...

Kim Kardashian West; Michael Sheen (Masters of Sex (2013) and Far from the Madding Crowd (2015)). Also: Yelawolf performs with Travis Barker. ...

Billy Crystal (The Comedians (2015)); animal handler Dave Salmoni. Also: Modest Mouse perform. ...

Patricia Heaton (The Middle (2009)). Also: Tim McGraw performs. ...

Kevin Spacey (House of Cards (2013)); Ioan Gruffudd (Keep Watching (2017) and San Andreas (2015)). Also: Stromae performs. ...

Anthony Anderson, Tracee Ellis Ross and Laurence Fishburne (Black-ish (2014)); Guillermo Díaz (Scandal (2012)). Also: Earth Wind and Fire perform with Chicago. ...

Dr. Phil McGraw (Dr. Phil (2002)); professional boxer Manny Pacquiao. Also: Nicholas Murphy (aka Chet Faker) performs. ...

Courteney Cox (Cougar Town (2009)); chef Steve Martorano. Also: Alabama Shakes perform. ...

John Stamos (Members Only (2015)); Michael B. Jordan (Fantastic Four (2015)). Also: Matt and Kim perform. ...

Jamie Foxx; Betty White (Hot in Cleveland (2010)). Also: Jamie Foxx performs with Chris Brown and Kid Ink. ...

Tim Allen (Last Man Standing (2011)); Kiernan Shipka (Mad Men (2007)). Also: 'Drew Holcomb and The Neighbors' perform. ...

Cobie Smulders (Avengers: Age of Ultron (2015)); BBQ cooking expert Aaron Franklin. Also: Chic performs with Nile Rodgers. ...

Robert Downey Jr., Chris Hemsworth, Chris Evans, Scarlett Johansson, Jeremy Renner and Mark Ruffalo (Avengers: Age of Ultron (2015)). Also: The War on Drugs perform. ...

Jason Statham (Furious 7 (2015)); NBA analyst Jalen Rose. Also: Brian Wilson performs. ...

Dwayne Johnson (Furious 7 (2015)); Rihanna. Also: Death Cab for Cutie perform. ...

Kurt Russell (Furious 7 (2015)); comedian Jeff Ross. Also: Van Halen perform. ...

Vin Diesel (Furious 7 (2015)). Also: Van Halen perform. ...

Zooey Deschanel (New Girl (2011) and The Driftless Area (2015)); Jeff Perry (Scandal (2012)). Also: Charlie Wilson performs. ...

Matthew Perry (The Odd Couple (2015)); professional wrestler John Cena. Also: For King and Country perform. ...